public int Vote(int id, string userId)
{
var user = this.Data.Users.Find(userId);
var picture = this.Data.Pictures.Find(id);
if (picture.Contest.Status != ContestStatus.Active)
{
throw new BadRequestException("The contest is closed.");
}
var votingStrategy =
StrategyFactory.GetVotingStrategy(picture.Contest.VotingStrategy.VotingStrategyType);
votingStrategy.CheckPermission(this.Data, user, picture.Contest);
if (picture.Votes.Any(v => v.UserId == user.Id))
{
throw new BadRequestException("You have already voted for this picture.");
}
var vote = new Vote {
PictureId = picture.Id, UserId = user.Id
};
this.Data.Votes.Add(vote);
this.Data.SaveChanges();
return(picture.Votes.Select(p => p.Id).Count());
}